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<tr class="t-nv-h1"><td colspan="5">空终止字符串</td></tr>
<tr class="t-nv"><td colspan="5"><a href="string/byte.html" title="cpp/string/byte">字节字符串</a></td></tr>
<tr class="t-nv"><td colspan="5"><a href="string/multibyte.html" title="cpp/string/multibyte">多字节字符串</a></td></tr>
<tr class="t-nv"><td colspan="5"><a href="string/wide.html" title="cpp/string/wide">宽字符串</a></td></tr>
<tr class="t-nv-h1"><td colspan="5">类</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="string/basic_string.html" title="cpp/string/basic string"><span class="t-lines"><span>basic_string</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="string/basic_string_view.html" title="cpp/string/basic string view"><span class="t-lines"><span>basic_string_view</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="string/char_traits.html" title="cpp/string/char traits"><span class="t-lines"><span>char_traits</span></span></a></div></div></td></tr>
</table></div><div></div></div></div></div><div class="t-navbar-sep"> </div></div>
<p>C++ 字符串库支持三种通用字符串类型：
</p>
<ul><li> <span class="t-lc"><a href="string/basic_string.html" title="cpp/string/basic string">std::basic_string</a></span> ——为操作任何字符类型的字符串设计的模板类。
</li><li> <span class="t-lc"><a href="string/basic_string_view.html" title="cpp/string/basic string view">std::basic_string_view</a></span> <span class="t-mark-rev t-since-cxx17">(C++17)</span> ——对于字符串子序列的轻量无所有权的只读视图。
</li><li> 空终止字符串 - 以特殊的<i>空</i>字符终止的字符数组。
</li></ul>
<h3><span class="mw-headline" id="std::basic_string"><span class="t-lc"><a href="string/basic_string.html" title="cpp/string/basic string">std::basic_string</a></span></span></h3>
<p>模板类 <span class="t-lc"><a href="string/basic_string.html" title="cpp/string/basic string">std::basic_string</a></span> 通用化字符序列如何操作及存储。字符串创建、操作及析构全部为便利的类方法集合与相关函数所处理。
</p><p>标准提供 <span class="t-lc"><a href="string/basic_string.html" title="cpp/string/basic string">std::basic_string</a></span> 对常用类型的数种特化：
</p>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>定义于头文件 <code>&lt;string&gt;</code> </div>
</td></tr>

<tr class="t-dsc-sep">
<td colspan="2">  
</td></tr>
<tr class="t-dsc-hitem">
<td> 类型
</td>
<td> 定义
</td></tr>


<tr class="t-dsc">
<td>  <span class="t-lc"><a href="string/basic_string.html" title="cpp/string/basic string">std::string</a></span>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="string/basic_string.html"><span class="kw1228">std::<span class="me2">basic_string</span></span></a><span class="sy1">&lt;</span><span class="kw4">char</span><span class="sy1">&gt;</span></span></span>
</td></tr>

<tr class="t-dsc">
<td>  <span class="t-lc"><a href="string/basic_string.html" title="cpp/string/basic string">std::wstring</a></span>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="string/basic_string.html"><span class="kw1228">std::<span class="me2">basic_string</span></span></a><span class="sy1">&lt;</span><span class="kw4">wchar_t</span><span class="sy1">&gt;</span></span></span>
</td></tr>

<tr class="t-dsc">
<td>  <span class="t-lc">std::u8string</span> <span class="t-mark-rev t-since-cxx20">(C++20 起)</span>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="string/basic_string.html"><span class="kw1228">std::<span class="me2">basic_string</span></span></a><span class="sy1">&lt;</span>char8_t<span class="sy1">&gt;</span></span></span>
</td></tr>

<tr class="t-dsc">
<td>  <span class="t-lc"><a href="string/basic_string.html" title="cpp/string/basic string">std::u16string</a></span> <span class="t-mark-rev t-since-cxx11">(C++11 起)</span>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="string/basic_string.html"><span class="kw1228">std::<span class="me2">basic_string</span></span></a><span class="sy1">&lt;</span><span class="kw4">char16_t</span><span class="sy1">&gt;</span></span></span>
</td></tr>

<tr class="t-dsc">
<td>  <span class="t-lc"><a href="string/basic_string.html" title="cpp/string/basic string">std::u32string</a></span> <span class="t-mark-rev t-since-cxx11">(C++11 起)</span>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="string/basic_string.html"><span class="kw1228">std::<span class="me2">basic_string</span></span></a><span class="sy1">&lt;</span><span class="kw4">char32_t</span><span class="sy1">&gt;</span></span></span>
</td></tr>
</table>
 <table class="t-rev-begin">
<tr class="t-rev t-since-cxx17"><td>
<h3> <span class="mw-headline" id="std::basic_string_view"><a href="string/basic_string_view.html" title="cpp/string/basic string view"><tt>std::basic_string_view</tt></a></span></h3>
<p>模板类 <span class="t-lc"><a href="string/basic_string_view.html" title="cpp/string/basic string view">std::basic_string_view</a></span> 提供一个轻量对象，它使用类似 <span class="t-lc"><a href="string/basic_string.html" title="cpp/string/basic string">std::basic_string</a></span> 接口的接口，提供对字符串一部分的只读访问。
</p><p>标准提供 <span class="t-lc"><a href="string/basic_string_view.html" title="cpp/string/basic string view">std::basic_string_view</a></span> 对常用类型的数种特化：
</p>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>定义于头文件 <code>&lt;string_view&gt;</code> </div>
</td></tr>

<tr class="t-dsc-sep">
<td colspan="2">  
</td></tr>
<tr class="t-dsc-hitem">
<td> 类型
</td>
<td> 定义
</td></tr>


<tr class="t-dsc">
<td>  <span class="t-lc"><a href="string/basic_string_view.html" title="cpp/string/basic string view">std::string_view</a></span> <span class="t-mark-rev t-since-cxx17">(C++17 起)</span>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="string/basic_string_view.html"><span class="kw1246">std::<span class="me2">basic_string_view</span></span></a><span class="sy1">&lt;</span><span class="kw4">char</span><span class="sy1">&gt;</span></span></span>
</td></tr>

<tr class="t-dsc">
<td>  <span class="t-lc"><a href="string/basic_string_view.html" title="cpp/string/basic string view">std::wstring_view</a></span> <span class="t-mark-rev t-since-cxx17">(C++17 起)</span>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="string/basic_string_view.html"><span class="kw1246">std::<span class="me2">basic_string_view</span></span></a><span class="sy1">&lt;</span><span class="kw4">wchar_t</span><span class="sy1">&gt;</span></span></span>
</td></tr>

<tr class="t-dsc">
<td>  <span class="t-lc">std::u8string_view</span> <span class="t-mark-rev t-since-cxx20">(C++20 起)</span>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="string/basic_string_view.html"><span class="kw1246">std::<span class="me2">basic_string_view</span></span></a><span class="sy1">&lt;</span>char8_t<span class="sy1">&gt;</span></span></span>
</td></tr>

<tr class="t-dsc">
<td>  <span class="t-lc"><a href="string/basic_string_view.html" title="cpp/string/basic string view">std::u16string_view</a></span> <span class="t-mark-rev t-since-cxx17">(C++17 起)</span>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="string/basic_string_view.html"><span class="kw1246">std::<span class="me2">basic_string_view</span></span></a><span class="sy1">&lt;</span><span class="kw4">char16_t</span><span class="sy1">&gt;</span></span></span>
</td></tr>

<tr class="t-dsc">
<td>  <span class="t-lc"><a href="string/basic_string_view.html" title="cpp/string/basic string view">std::u32string_view</a></span> <span class="t-mark-rev t-since-cxx17">(C++17 起)</span>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="string/basic_string_view.html"><span class="kw1246">std::<span class="me2">basic_string_view</span></span></a><span class="sy1">&lt;</span><span class="kw4">char32_t</span><span class="sy1">&gt;</span></span></span>
</td></tr>
</table>
</td>
<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td></tr>
</table>
<h3><span class="mw-headline" id=".E7.A9.BA.E7.BB.88.E6.AD.A2.E5.AD.97.E7.AC.A6.E4.B8.B2">空终止字符串</span></h3>
<p>空终止字符串是以特殊的<i>空</i>字符终止的字符数组。C++提供创建、检查及修改空终止字符串的函数。
</p><p>空终止字符串有三种类型：
</p>
<ul><li> <a href="string/byte.html" title="cpp/string/byte">空终止字节字符串</a>
</li><li> <a href="string/multibyte.html" title="cpp/string/multibyte">空终止多字节字符串</a>
</li><li> <a href="string/wide.html" title="cpp/string/wide">空终止宽字符串</a>
</li></ul>
<h3><span class="mw-headline" id=".E9.99.84.E5.8A.A0.E6.94.AF.E6.8C.81">附加支持</span></h3>
<h4><span class="mw-headline" id="std::char_traits"><span class="t-lc"><a href="string/char_traits.html" title="cpp/string/char traits">std::char_traits</a></span></span></h4>
<p>字符串库亦提供类模板 <span class="t-lc"><a href="string/char_traits.html" title="cpp/string/char traits">std::char_traits</a></span> ，它为 <span class="t-lc"><a href="string/basic_string.html" title="cpp/string/basic string">std::basic_string</a></span> <span class="t-rev-inl t-since-cxx17"><span>和 <span class="t-lc"><a href="string/basic_string_view.html" title="cpp/string/basic string view">std::basic_string_view</a></span> </span> <span><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></span></span>定义类型和函数。标准定义下列特化：
</p>
<table class="t-dcl-begin"><tbody>
<tr class="t-dsc-header">
<td> <div>定义于头文件 <code><a href="header/string.html" title="cpp/header/string">&lt;string&gt;</a></code>
 </div></td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;&gt;</span> <span class="kw1">class</span> char_traits<span class="sy1">&lt;</span><span class="kw4">char</span><span class="sy1">&gt;</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;&gt;</span> <span class="kw1">class</span> char_traits<span class="sy1">&lt;</span><span class="kw4">wchar_t</span><span class="sy1">&gt;</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl t-since-cxx20">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;&gt;</span> <span class="kw1">class</span> char_traits<span class="sy1">&lt;</span>char8_t<span class="sy1">&gt;</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-cxx20">(C++20 起)</span> </td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;&gt;</span> <span class="kw1">class</span> char_traits<span class="sy1">&lt;</span><span class="kw4">char16_t</span><span class="sy1">&gt;</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-cxx11">(C++11 起)</span> </td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;&gt;</span> <span class="kw1">class</span> char_traits<span class="sy1">&lt;</span><span class="kw4">char32_t</span><span class="sy1">&gt;</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-cxx11">(C++11 起)</span> </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<h4><span class="mw-headline" id=".E8.BD.AC.E6.8D.A2.E4.B8.8E.E5.88.86.E7.B1.BB">转换与分类</span></h4>
<p><a href="locale.html" title="cpp/locale">本地化库</a>提供对字符串转换的支持（例如 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="locale/wstring_convert.html"><span class="kw1899">std::<span class="me2">wstring_convert</span></span></a></span></span> 或 <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">toupper</span></span></span> ），还有分类字符的函数（例如 <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">isspace</span></span></span> 或 <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">isdigit</span></span></span> ）。
</p>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
<table class="t-dsc-begin">

</table>

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